MySQL IAM

[sethsamuel]

What does this PR do? What is the motivation?

Adds documentation on MySQL IAM authentication for https://github.com/DataDog/integrations-core/pull/20176

Merge instructions

Merge readiness:

• [x] Ready for merge

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Additional notes

[github-actions[bot]]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/seth.samuel/mysql-iam/database_monitoring/guide/managed_authentication

[buraizu]

Created DOCS-11277 to follow up